圆叶牵牛

trailing vine on exposed outcrop of Volcanic rhyolite tuff

trailing vine on exposed outcrop of volcanic rhyolite tuff

trailing vine on exposed outcrop of volcanic rhyolite tuff

roadside gravels at base of road cut in rhyolite

roadside gravels at base of road cut in rhyolite

roadside gravels at base of road cut in rhyolite

roadside gravels at base of road cut in rhyolite

Pine shaded, fallow/overgrown pasture on low hillside in tuffaceous rhyolite gravels

Pine shaded, fallow/overgrown pasture on low hillside in tuffaceous rhyolite gravels

Pine shaded, fallow/overgrown pasture on low hillside in tuffaceous rhyolite gravels

roadside in reddish volcanic rhyolite of grassy mid-slope hillside with Dahilia scherffii, Salvia emaciate, Verbena pintorum and scattered Pinus cembroides, Quercis hypoleucoides & arizonica, Juniperus deppeana, Rhus trilobata

Note retorse tricomes on upper leaf surface. Twinning plant, roadside in reddish volcanic rhyolite of grassy mid-slope hillside with Dahilia scherffii, Salvia emaciate, Verbena pintorum

Note spreading pustular hairs on bracts of immature fruit capsule. Twinning plant, roadside in reddish volcanic rhyolite of grassy mid-slope hillside with Dahilia scherffii, Salvia emaciate, Verbena pintorum

plant in coarse volcanic gravels at edge of streambed

plant in coarse volcanic gravels at edge of streambed

on open, grassy, undulating plain in basin along & below eastern Madrean escarpment, among diverse grasses and forbs on coarse volcanic alluvium.

sepals ca. 16 mm long, lanceolate at tip; plants annual (garden weed)

sepals ca. 16 mm long, lanceolate at tip; plants annual (garden weed)

sepals ca. 16 mm long, lanceolate at tip; plants annual (garden weed)